AND GENERA OF PLANTS. 407 



ARNICA. (Linn.) 



Arnica angustifolia, Vahl. A. fulgens, Pursh, Flor. Bor. Am., Vol. II., 

 p. 527. 



Hab. On the plains of the Platte to the Rocky Mountains. Labrador, (Schweinitz!) from which 

 locality it appears to be the A. plantaginea of Pursh. 



Arnica * lanceolata; stem leaves about three pairs, semiamplexicaule, lanceo- 

 late or oblong-lanceolate, three-nerved, acute, irregularly dentate-serrate, nearly 

 smooth, with the margin and stem pubescent; capituli about three, pedunculate; 

 involucrum longer than the disk; sepals about twelve to fifteen, lanceolate, acu- 

 minate, hirsute and glandular, as well as the peduncle; achenium also hirsute; 



pappus nearly plumose. 



Hab. On the White Mountains of New Hampshire, at the elevation of four thousand five hundred 

 feet, (according to the observation of my friend Charles Pickering.) A very distinct species, allied, 

 apparently, to A. Chamissonis. About a foot high, leaves two to three inches long, one to one 

 and a half wide, of a thin consistence, and nearly as large at the summit as at the base of the stem; 

 the lowest leaves somewhat cuneate, sessile. Stigmas much exserted, clavately thickened at the 

 summit, and pubescent below the point; those of the ray long and filiform, much exserted: the ray 

 without any rudiments of stamina, two and three-toothed at the extremity. 



Arnica *foliosa; pubescent and minutely glandular; stem leaves three to 

 five pairs, lanceolate or oblong-lanceolate, subacute, the radical and lower mostly 

 long petiolate or attenuate, often subserrate; capituli three to five, long pedun- 

 culate; involucrum about the length of the disk, the segments linear-lanceolate, 

 subacute and pilose at the tips; rays scarcely longer than the involucrum, with- 

 out abortive filaments; achenium pubescent. 



Hab. On the alluvial flats of the Colorado of the West, particularly near Bear River, of the lake 

 Timpanagos, A species of somewhat variable aspect, allied to A. angustifolia, but very distinct; 

 the rays much shorter, narrower, and sulphur yellow. In the slender form the stem is about a 

 foot high, with the radical leaves narrow lanceolate, mostly entire, and attenuated into a long 

 petiole, the two or three upper pairs sessile and semiamplexicaule. In another variety, which I 

 call /3. * andina, the radical leaves are ovate-lanceolate, and usually subserrate, with a shorter stem, 

 and more numerous flowers ; sepals somewhat biserial, about fifteen or sixteen, more or less hirsute, 

 not acuminate; point of the stigma thickened, with a somewhat conic point. This variety appears 

 to be allied to A. Chamissonis, but the achenium is less hirsute than in A. montana, and the 

 sepals rather obtuse than acuminate, &c. 



Arnica Menziesii, Hook. Flor. Bor. Am., t. 111. 



Hab. In the Rocky Mountains, in the central chain, where it is sometimes diminished in size 



